Seymour Bicknell Young Sr. (October 3, 1837 – December 15, 1924) was a general authority of the Church of Jesus Christ of Latter-day Saints from 1882 until his death.

As an infant, Seymour Young was present with his mother at the Haun's Mill massacre.

He moved with his family to Nauvoo, Illinois in 1839 and then to the Salt Lake Valley as Mormon pioneers in 1850.

From 1857 to 1858, Young served as a Mormon missionary in England, working primarily in Yorkshire and Lincolnshire.

In 1870 and 1871 Young accompanied his father on a mission to England and Scotland; the two also preached in and visited relatives in Ohio and New York.